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/*
* Copyright (C) the FFLAS-FFPACK group
* Written by Ziad Sultan <ziad.sultan@imag.fr>
*
* This file is Free Software and part of FFLAS-FFPACK.
*
* ========LICENCE========
* This file is part of the library FFLAS-FFPACK.
*
* FFLAS-FFPACK is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* ========LICENCE========
*.
*/
#undef __FFLASFFPACK_USE_OPENMP
#define __FFLASFFPACK_USE_TBB
#include <string>
#include "fflas-ffpack/utils/timer.h"
#include "fflas-ffpack/fflas/fflas.h"
#include "fflas-ffpack/utils/args-parser.h"
size_t add(const size_t x, const size_t y)
{
return x+y;
}
size_t seq_fib(size_t n) {
if (n < 2)
return n;
else
return seq_fib(n-1) + seq_fib(n-2);
}
size_t par_fib(const size_t n, const size_t cutoff)
{
size_t x=0, y=0, z=0;
// if (n < 2)
// return n;
if (n < cutoff) // The bigger the cutoff the bigger is the parallel speed-up
return seq_fib(n);
else{
SYNCH_GROUP(
TASK(MODE(READ(n) WRITE(x) CONSTREFERENCE(x)),
x = par_fib(n-1, cutoff);
);
TASK(MODE(READ(n) WRITE(y) CONSTREFERENCE(y)),
y = par_fib(n-2, cutoff);
);
CHECK_DEPENDENCIES;
TASK(MODE(READ(x,y) WRITE(z) CONSTREFERENCE(z,x,y)),
z=add(x,y);
);
);//end SYNCH_GROUP
return z;
}
}
int main(int argc, char** argv)
{
size_t n = 20;
bool p = true;
size_t iters = 3;
size_t cutoff = 2;
// int64_t q = 131071 ;
// int proc = MAX_THREADS;
Argument as[] = {
{ 'n', "-n N", "Set the nth number of fibonacci to compute", TYPE_INT , &n },
{ 'c', "-c N", "Set the Cutoff at which the sequential base case is called (the bigger the cuttof is the better is the parallel speed-up)", TYPE_INT , &cutoff },
{ 'i', "-i N", "Set number of repetitions.", TYPE_INT , &iters },
{ 'p', "-p Y/N", "run the parallel program using Parallel(Y)/Sequential(N).", TYPE_BOOL , &p },
END_OF_ARGUMENTS
};
FFLAS::parseArguments(argc,argv,as);
// { 't', "-t N", "Set number of processors.", TYPE_INT , &proc },
size_t f=0;
// time
FFLAS::Timer chrono;
double *time=new double[iters];
// parallel add using PARFOR1D
for (size_t it=0;it<=iters;++it){
chrono.clear();
if (it) chrono.start();
if(p){
PAR_BLOCK{
f=par_fib(n, cutoff);
}// end of PAR_BLOCK
}
else
f=seq_fib(n);
if (it) {chrono.stop(); time[it-1]=chrono.realtime();}
}
std::sort(time, time+iters);
double meantime = time[iters/2];
delete[] time;
// sequential add
chrono.clear();
chrono.start();
size_t l=seq_fib(n);
chrono.stop();
double timeseq = chrono.realtime();
// verification of the parallel result
if (f!=l)
std::cout<<"FAIL: Par_Fib("<<n<<") = "<<f<<" and Seq_Fib("<<n<<") = "<<l<<std::endl;
else
std::cout<<"PASS"<<std::endl;
std::cout<<" n: "<<n;
std::cout<<" SeqTime: "<<timeseq;
std::cout<<" ParTime: " << meantime;
std::string dataflow;
#ifdef __FFLASFFPACK_USE_DATAFLOW // OMP/KAAPI dataflow option
dataflow = " with dataflow synch!";
#else
dataflow = " with explicit synch!";
#endif
std::cout<<dataflow<<std::endl;
return 0;
}
/* -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
// vim:sts=4:sw=4:ts=4:et:sr:cino=>s,f0,{0,g0,(0,\:0,t0,+0,=s
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